Control module
| Control module | 
| To remove | 
| 1. | Remove the cover over the combustion air fan.   
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| 2. | Remove the four control module bolts. | |
| 3. | Detach the housing and carefully extract the control module, unplug the connector and remove the control module from the heater.   | |
| To fit | 
 
    
    | 1. | Plug connector B2 into the control module. Fit the housing. | |
| 2. | Fit the control module.   | |
| 3. | Fit the cover. 
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